|Pos|Rider|Manufacturer|Time/Retired|Points|
|---|---|---|---|---|
|1|Loris Capirossi|Honda|43:06.089|25|
|2|Doriano Romboni|Honda|+0.689|20|
|3|Max Biaggi|Aprilia|+1.181|16|
|4|Ralf Waldmann|Honda|+5.123|13|
|5|Jean-Michel Bayle|Aprilia|+5.528|11|
|6|Nobuatsu Aoki|Honda|+5.821|10|
|7|Jean Philippe Ruggia|Aprilia|+9.018|9|
|8|Tetsuya Harada|Yamaha|+24.059|8|
|9|Tadayuki Okada|Honda|+29.043|7|
|10|Wilco Zeelenberg|Honda|+36.273|6|
|11|Toshihiko Honma|Yamaha|+41.787|5|
|12|Adrien Bosshard|Honda|+52.489|4|
|13|Carlos Checa|Honda|+57.206|3|
|14|Eskil Suter|Aprilia|+1:01.503|2|
|15|Luis Maurel|Honda|+1:03.353|1|
|16|Patrick vd Goorbergh|Aprilia|+1:04.277||
|17|Adolf Stadler|Honda|+1:16.427||
|18|Juan Borja|Honda|+1:19.607||
|19|Chrisrian Boudinot|Aprilia|+1:20.163||
|20|Bernd Kassner|Aprilia|+1:20.761||
|21|Andreas Preining|Aprilia|+1:26.864||
|22|Noel Ferro|Honda|+1:27.009||
|23|Sebastien Scarnato|Honda|+1:36.321||
|24|Krisse Kaas|Yamaha|+1 Lap||
|25|Donnie Hough|Honda|+1 Lap||
|Ret|Rodney Fee|Honda|Retirement||
|Ret|Jurgen vd Goorbergh|Aprilia|Retirement||
|Ret|Luis D'Antin|Honda|Retirement||
|Ret|Manuel Hernandez|Aprilia|Retirement||
|Ret|Frederic Protat|Honda|Retirement||
|Ret|Giuseppe Fiorillo|Honda|Retirement||
|Ret|José Luis Cardoso|Aprilia|Retirement||
|Ret|Enrique de Juan|Aprilia|Retirement||
|Ret|Alessandro Gramigni|Aprilia|Retirement||

Question: how many total riders rode a yamaha bike?
Answer: 3